Apparatus for removing dust



'A. B. FOWLER. APPARATUSFOHREMOVING DUSTi APPucmoN men SEPT 21. I917.

1,402,755, Patented Jan. 10,1922.

umrsn earner orrrcs.

ALFRED B FC WLER, OF BETTE ELY, MASSACHUSETTS, ASSIGNOE, BY MESNE ASSIGN- MEETS, TO UNITED SHOE MACHINERY CORPORATION, OF PATEBSON, NEW JERSEY,

A CORPORATION OF E E W J APPARATUS FOB, REMOVING ID'U'S'IL Application filed September Dust of which the tollowin descri )tion in J 1 ED 9 connection withthe accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

. This invention relates to abrading niachines and is herein illustrated as embodied 1n a machine for buffing the bottoms of boots and shoes. v

Inbutfing the'bottoms of boots and shoes a large amount of dust is generated for the around by it.

removalotwhich dust-hoods of various constructlons have been provided but thus tar without satisfactory results. In the bufling operation the shoe is held against the lower forward portion of thebutiing roll, the bull: I

of thedust being thrown off by the roll in a l generally backward direct on while the remainder is carried around theroll atter the manner of an atmosphere. The hoods which have been commonly used hitherto have to an extent carried away the dust which is thrown off by the roll but have been ineti'ee tive'to carry away that which is carried The general object of the present inven ,;tion is to provide means for breaking up and carrying away the film or envelope of dust bearing atmosphere which is carried around by the roll; as well as to provide improved I means for carrying away the dust which is 1 centrifugally thrown ofi' by theroll.

\ A feature of the invention comprises means forapplying aconcentrated draft to. the tool to break up and draw away the film of dust bea-ring atmosphere carried around by the tool during the bufiing operation, Preferably this means comprises a partition or diaphragm concentric with the tool, lo

jcated close to its rear surface and provided with suction ports otsmall cross-section.

: The suction is thus concentratedat these points so that the pressure of the outside atmosphere, and centrifugal force, will cause Patented Jan. 10, 1922.

21, 1917. Serial No. 192,502.

and is carried around by the roll to be broken up and removed through the ports 33.

This and other features of the invention, including certain details of construction and combinations of parts, will be described as embodied in an illustrative machine and pointed out in the appended claims. 1 Referring to the accompanying draw- 1ngs,--

Fig. 1 is a perspective View of the head of a bufiing machine, in which the present invention is embodied;

Fig. 2 is a cross-section through the dusthood and one of the buffing rolls a shoe be ing shown in dotted lines in position to be buffed;

3 IS a cross-section similar to Fig. 2,

but showing the cover raised and the diaphragm moved away tromthe roll to ta cilitate the removing and replacing otthe machine is the'usual shaft 5 having at one enda pulley 7 by which it may be driven. The bufling rolls 9, one havmg a coarse and the other a fine sandpaper cover are mounted upon the shaft in the usnalinanner, said rolls being of the common split type com prising two half-cylinders hinged together and adapted to be opened and closed when the sandpaper covers are removed and re-- placed. The hood 11, which hasthe usual outlet 13 adaptedto be connected to any suitable suction device, has a lower wall 15 which extends into proximity to the lowerpart of the rolls and an upper wall 19 upon which the cover 21 is mounted. This cover has formed upon or fast to its ends bell crank of the'hood. It is evident that when thelevers are swung back, as illustrated in Fig. 3, the cover will be raised. Normally, however, the cover lies close to the top of the roll as shown in Figs. 1 and 2.

As has been stated, the shoe'is presented to the roll in the position indicated in Fig. 2. The dust is generated at the point of contact and-a large part of it is thrown off levers 23 having trunnions 25 which are rotatable in lugs 27 formed on the upper wall tangentially. The edge ofthe lower wall 15 of the hood should be somewhat below this point in order to carry away this dust, but if it is located properly for this purpose the opening between it and the roll is so great that the force of the suction is liable to be dissipated owing to the size of the opening as compared to that of the outlet pipe 13. If the force of the suction available were unlimited this difficulty would not present itself, but the force available in the ordinary shoe factory is always quite limited and must be conserved or concentrated to be efficient. For the purpose of narrowing the effective area of the mouth of the hood, as well as for another purpose presently to be described, a partition or diaphragm 29 located close to the rear of the rolls has its lower edge extending down into proximity to the edge of the lower wall 15 of the hood so as to provide a restricted opening or mouth which concentrates the draft at this point and removes the dust which is thrown off by the rotating roll.

Said lower edge is also close to the roll and it therefore serves to divide the inflowing current of air so that the portion of air which flows between the diaphragm and the draw it away. The sum of the areas of the cross-sections of the mouth and of the ports 33 should be not greater than the area of the V cross-section of the outlet pipe 13.

Preferably itshould be less; but whatever the exact relation, the draft should'be strong ceive pins 41 carried by-the end walls of the at the points mentioned, and particularly at the ports 33 where the rotation of. the roll is acting to carry the dustout of the hood. 7

In order to facilitate the removal of the sandpaper cover of the roll and its replacement by a fresh one, the diaphra m 29 is arranged to be moved back away from the roll when desired. To this end'ta-ils' 35 formed integral with the diaphragm are provided withslots 39 and pins 47. The slots 39 rehood, and the pins 47 pass through slots formed in said walls. Levers 43 pivoted at their middle portions to said end walls have yokes at both ends, the upper yokes engaglng eccentric pins 45 on the hubs of the bell crank levers 23, and the lower yokes 37 en gagmg'the pins 47 on the tails 35 of the diaphragm. i/Vhen, therefore, the bell crank levers 23 are moved into the position shown in Fig. 3, the cover 21 is swung back and the diaphragm moved back away from the roll of the hood, one wall of the so that the sandpaper cover of the roll may readily be removed and replaced.

Although the invention has been set forth as embodied in a particular machine, it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described. 7

Having thus described my invention, what 1 claim as new and desire to secure by Letters Patent of the United States is 2- 1. A machine of the class described hav ing, in combination, a dust-hood through which air is drawn to remove the dust generated by an abrading operation, a rotary abrading tool partially closing the open end of the hood, one wall of the hood terminating in a portion spaced from the periphery of the tool to forman ingress opening, and

a diaphragm curved closely about the pe riphery of the tool and terminating at the ingress opening to divide the draft and confine a'portion thereof on the periphery of the tool to draw away the atmosphere carried around by the tool during its rotation.

2. A machine ofthe' class described having, in combination, a dust-hood through which air is drawn to remove the dust generated by an abrading operation, a rotary the open end 00d terminatingin a portion spaced from the periphery abrading tool partially closing of the tool to form afmain suction opening for abrasive particles and air, and means to decrease the main suction opening and to confine a portion of the draft close to the periphery of the tool to draw away the atmosphere carried around by the tool during its rotation. v I

3. A machine of the class described having, in combination, a dust-hoodthrough which air is drawntoremove the dust generated by an abrading operation, a rotary abrading tool partially closing theopen end" of the hood, one wall of the'hood terminating in a portion spaced from the periphery of the tool to form an ingress opening for abrasive particles and air, and a curved diaphram within the hood and conforming closely to the periphery of. the tool and terminating near the ingress opening, the diaphragm constructed witha suctlon port of small cross section opposite the periphery of the tool to'draw off the atmosphere carried around by the tool during its rotation.

at. A machine of the class described having, in combination, a rotary abrading tool,

operation, said hood having a cover locate close to thetop of the tool, a diaphragm located close to the rear of the tool, said diaphragm being provided'with a suction a dust-hood through which air is drawn to remove thedust generated by the abrading rotation, and means for moving the cover and means connecting the cover and the diaand the diaphragm away from the tool in phragm constructed and arranged to move 10 different directions. the diaphragm away from the tool in a dif- 5. A machine of theclass described, havferent direction from the cover when the ing in combination, a rotary abrading tool, cover is raised. a dust hood, said hood having a cover 10- In testimony whereof I have signed my cated close to the top of the tool, a dianame to this specification. phragm located close to the rear of the tool, ALFRED B. FOWLER. 

